EP 0475893 B1 19941214 - Method of purifying bisphenol-A.
Title (en)
Method of purifying bisphenol-A.
Title (de)
Reinigungsverfahren für Bisphenol-A.
Title (fr)
Procédé d'épuration de bisphénol-A.
Publication
Application
Priority
- US 57838590 A 19900907
- US 68127891 A 19910408
Abstract (en)
[origin: EP0475893A1] Impure bisphenol-A is purified by fractional melt crystallization in a falling film dynamic crystallizer. Surprisingly bisphenol-A is frozen out in its orthorhombic crystalline form. Whereas in normal melt crystallization thermal and catalytic degradation would be a problem, fractional melt crystallization in a falling film dynamic crystallizer causes no serious degradation, because it requires relatively little time. <IMAGE>
IPC 1-7
IPC 8 full level
C07C 37/84 (2006.01); C07C 39/16 (2006.01)
CPC (source: EP KR US)
C07C 37/84 (2013.01 - EP US); C07C 39/12 (2013.01 - KR)
Designated contracting state (EPC)
BE DE ES FR GB IT NL
DOCDB simple family (publication)
EP 0475893 A1 19920318; EP 0475893 B1 19941214; AU 649711 B2 19940602; AU 8367991 A 19920319; CN 1029226 C 19950705; CN 1060088 A 19920408; DE 69105887 D1 19950126; DE 69105887 T2 19950504; ES 2066408 T3 19950301; JP 2949163 B2 19990913; JP H05132441 A 19930528; KR 100216330 B1 19990816; KR 920006274 A 19920427; US 5243093 A 19930907; US 5362900 A 19941108; US 5475152 A 19951212
DOCDB simple family (application)
EP 91810653 A 19910819; AU 8367991 A 19910905; CN 91108876 A 19910907; DE 69105887 T 19910819; ES 91810653 T 19910819; JP 25430991 A 19910906; KR 910015569 A 19910906; US 10834793 A 19930818; US 32974694 A 19941026; US 68127891 A 19910408